Many computer security technologies are at risk of proving failure to their extreme vulnerability. Our computers defense mechanisms have been going on for years now and yet have not resulted in an extremely flexible set of protections. Organizations focus on the ability of security technology to minimise risks but threats to computer security are continuing. In other disciplines, looking to nature has proven extremely valuable. Perhaps we can look to nature to help the understanding of threats to computer systems and even find strategies for protecting them. A significant focus on nature is more useful in divulging computer security issues. The work presented here is an attempt to work out the rudimentary principles of defense mechanisms theory. More specifically, we have attempted to lay out a framework within which the defence mechanisms may be systematically defined, generated and classified through nature. The approach we have used in this paper falls generally within the use of nature to explain security threats, although the developments are elementary we believe, they are totally self-contained within the context of our discussion.